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A159719 Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 5 local maxima. 2

%I #6 May 14 2020 16:13:14

%S 0,0,0,0,1480,1268292,279561086,36381368048,3573883594170,

%T 296395007981680,22044296362400136,1523944523765510064,

%U 100158396249221188476,6351609408030664973692,392562103869990035520330,23810390333486683269302048,1424190819067621511845096358

%N Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 5 local maxima.

%H Andrew Howroyd, <a href="/A159719/b159719.txt">Table of n, a(n) for n = 1..200</a>

%o (PARI) \\ CircPeaksBySig defined in A334778.

%o a(n) = {CircPeaksBySig(vector(n, i, 2), [5])[1]} \\ _Andrew Howroyd_, May 13 2020

%Y Column 5 of A334778.

%Y Cf. A159716.

%K nonn

%O 1,5

%A _R. H. Hardin_, Apr 20 2009

%E Terms a(10) and beyond from _Andrew Howroyd_, May 13 2020

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Last modified March 28 14:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)